Which statement is true about IP-IP tunnels?
A. The time-to-live value of the original packet is decremented.
B. IP-IP tunnels are protocol agnostic.
C. The packet is encapsulated unchanged before entering the tunnel.
D. The packet header is replaced before entering the tunnel.
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The correct answer is A
To encapsulate an IP packet in another IP packet, an outer header is added with Source IP, the entry point of the tunnel, and Destination IP, the exit point of the tunnel. While doing this, the inner packet is unmodified (except the TTL field, which is decremented).
The encapsulator does not change the inner IP header, except to decrement the time to live (TTL),
The answer is (A)
GRE tunnels are protocol agnostic, Probably – “c”